i BYZANTINE ARCHITECTURE 7 The church of the Koimesis at Nicaeal (Figs. 5 and 6) has no galleries to the sides. The aisles open into the central area by arcades, above which are triple windows over the aisle vaults. At the western end is a gallery above the narthex. The aisles are barrel-vaulted, and as the church is planned on an axis from east to west, and is not symmetrical on all three sides, it is regarded as a domed 10 0 I 2 34 567 8.9 (Oil 12BI46I61718 J920METERS BID iimi ii 11 (ill mi FIG. 4.—S. NICHOLAS, MYRA (Rott). basilica. It is such a form as might be developed from a basilica without galleries. In Constantinople there are three churches which seem to constitute a type apart, though resembling in many ways the types just considered. They are S. Andrew in Krisei, (p. 117), S. Mary Pammakaristos (p. 150), and S. Mary Panachrantos (p, 130). In these churches, as originally built, the central dome is carried on four arches which rise above a one-storied aisle or ambulatory, allowing of windows 1 Wulf, op. cit. p. 23.